On Fri, Mar 11, 2016 at 11:40:22PM +0800, Eryu Guan wrote: > This is a test that performs simple I/O on dm error device, which > returns EIO on all I/O request. > > This is motivated by an ext4 bug that crashes kernel on error path when > trying to update atime. Following kernel patch should fix the issue > > ext4: fix NULL pointer dereference in ext4_mark_inode_dirty() Why does this test require the loop device? Why can't you just unmount the filesystem, run 'blkdev --flushbufs <dev>' to ensure there are no cached buffers/pages on the block device, then mount it again? Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
